David James Elliott Lt., Lt. Cmdr. Harmon "Harm" Rabb, Jr. Actor Catherine Bell Maj., Lt. Col. Sarah "Mac" MacKenzie Actor Patrick Laborteaux Lt. j.g., Lt. Bud Roberts Actor John M. Jackson Actor Scott Lawrence Cmdr. Sturgis Turner Guest Star Terry O'Quinn Guest Star Paul Collins Guest Star John DeMita Guest Star Tracy Middendorf Guest Star Zach Grenier Guest Star J. Scott Shonka Guest Star Justin Urich Guest Star John D'Aquino Guest Star James Edson Guest Star W. K. Stratton Guest Star Jason Dohring Guest Star John Roselius Guest Star Jade Carter Guest Star Brady Smith Guest Star Joanie Fox Guest Star Donald P. Bellisario Executive Producer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Mark Horowitz Executive Producer Dennis Smith Director Dana Coen Writer